مجله فصل مشترک ها، لایه های نازک و سیستم های با بعد کم
بررسی اثرات نانو ذرات Zr بر پایداری فاز ساختاری، میکرو استرین ها، و میخکوبی شار در ابررسانای دمای بالای BSCCO آلاییده با Zr/Cu
نوع مقاله : مقاله پژوهشی
نویسندگان
آزمایشگاه تحقیقاتی ابررسانا و مغناطیس، دانشکده فیزیک، دانشگاه الزهرا
چکیده
در این تحقیق، مقاومت نمونه‌های پلی کریستالی BSCCO (Bi-2223) (x=0.0، 0.002، 0.0075 و 0.01) سنتز شده به روش سل-ژل تحت میدان مغناطیسی مورد بررسی قرار گرفته است. همچنین، خواص ساختاری و مورفولوژیکی ابررساناهای سرامیکی با استفاده از اندازه‌گیری‌های پراش پرتو ایکس (XRD) و میکروسکوپ الکترونی روبشی انتشار میدانی (FESEM) مورد بررسی قرار گرفته است. مشخص شد که فاز ساختاری Bi-2223 بیش از سایر فازها در نمونه های سنتز شده برای x≤0.0075 تشکیل شده است. بر اساس اندازه‌گیری‌های مقاومت، مشخص می‌شود که TC با افزایش دوپینگ Zr کاهش می‌یابد و دومین انتقال ابررسانا برای x≥0.0075 دیده می‌شود. مدل خزش شار فعال شده حرارتی (TAFC) در ابررساناهای سرامیکی سنتز شده بررسی شده است. علاوه بر این، رفتار مقاومت مغناطیسی همه نمونه ها برای تعیین وابستگی انرژی پینینگ با میدان های مغناطیسی اعمال شده و دوپینگ Zr مورد تجزیه و تحلیل قرار گرفته است. دریافتیم که انرژی پینینگ با افزایش دوپینگ Zr بطور قابل ملاحظه ای کاهش می یابد. بنابراین خزش گردشاره ها و عبور از سد انرژی با سهولت بیشتری رخ می دهد و بنابراین انرژی پینینگ با افزایش دوپینگ Zr کاهش می یابد. علاوه بر این، توافق خوبی بین مدل TAFC اصلاح شده و داده‌های تجربی برای ترکیبات سنتز شده به دست آمده است.
کلیدواژه‌ها
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